Using reference planes on base slabs the first opening is created correctly but the second, third etc. are not punching trough the base slab.
Reference planes and openings incorrect behavior
thank you for the feedback.
This problem was fixed in Allplan 2019-1.
S pozdravom | Best regards | Mit freundlichen Grüßen
Product Manager Allplan Architecture
As you can see above I intentionally added the Allplan 2019-1 tag to the topic, because it is happening right in that version.
The situation is the same when you not use the Default planes for a slab. The first opening correctly uses the custom bottom and top height settings while the second, third etc. openings use the Default planes for height settings.